Physics, 12.12.2020 15:50 chem1014

(HELP ME PLEASE I NEED TO GET MY GRADE UP PLEASEEE AND THE FIRST TIME I TOOK THE TEST I GOT A 2/10 PLEASE JUST HELP ASAP AND PLEASE GIVE ME THE RIGHT ANSWER Potential energy can be converted into kinetic energy, a good example of this is when a pole-vaulter bends the pole during a leap. When the pole is bent the most, does it store elastic or gravitational potential energy?

Question 7 options:

It has neither elastic or gravitational potential energy.

The pole stores gravitational potential energy because it is bent from its natural shape when off the ground.

The pole stores elastic potential energy when the pole is bent because its shape is change from its natural shape and it will want to go back to its original form.

Only gravitational potential energy because that is more powerful than elastic potential energy.

Question 8 (1 point)

Is the potential energy of the roller coaster elastic or gravitational?

Question 8 options:

gravitational

neither

both

elastic

Question 9 (1 point)

In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as skateboarder rides a pipeline or a pendulum moves, why did the bar for the total energy remain constant?

Question 9 options:

all answers given are correct

Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model.

Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved.

This is because no energy is being created or destroyed in this system.

Question 10 (1 point)

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In class we learned that a car model with a mass of 5.0 kg that is placed on a track 3.0 m off the ground and is traveling at a speed of 4 m/s. Has a measurable kinetic and potential energy. Calculate the total mechanical energy of the object using the formula ME = KE + PE when the KE is 40 joules and the PE is 147 joules. (You may use your calculator on this addition problem.)

Question 10 options:

187 J

147 J

40 J

60 J

Answers: 2

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